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mailbox database.edb and a sum of totalitemsize output difference

My Exchange 2007 server  has mailbox database.edb   file, that is  137 GB in size
If I pull  the report by running a command " Get-MailboxStatistics -Database “Mailbox Database” | Select DisplayName,  TotalItemSize | Export-CSV.." , then summarize TotalItemSize for all mailboxes, I am getting   160 GB number.  Several days ago it was 172 GB, but after the users ran some cleanup the size reduced to 160 GB. The size ofa  mailbox database.edb file  still is growing though.

Could anybody help me to figure out why there is a difference between the  size of mailbox database.edb file and a sum of all TotalItemSize items.

Thank you
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Suliman Abu Kharroub
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irinadruker

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I would understand  if I have .edb file larger then total up all the mailboxes plus white space, but the situation is opposite, .edb file is 137 GB, total up all the mailbox is 160 GB plus white space   is about  1 GB.
it is strange.are you sure all of these mailboxes hosted in one database ?
we have just one  database,  but we have a standby server  on the recovery site, with information store distmounted , replicated by a software  called ca xosoft, and I just wonder, if that might be something to do with this strange  issue
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is  it possible to confirm that is the case, I thought about it,  as our users are  sending multiple attachments to a number of people, but not sure how can I get the numbers
What do you mean confirm? Again there is no direct relation between the edb and the mailbox sizes.

Typically the edb will be bigger because of retention items, white space, table structures etc...

However in a case where same mail is sent to multiple users then sis will result in an edb smaller than the total of the mailboxes